Virtual Concatenation Group
Several Virtual Tributaries, form part of a Virtual Concatenation Group (VCG). Virtual Tributaries to transport data across a VCAT enabled network may, in many cases, particularly when the underlying network is relatively congested, cost less than finding just one path that meets the required capacity. Such splitting of paths oftens find shorter paths to channel the traffic.
The Virtual Concatenation protocol performs its content delivery through a process called byte-interleaving. For example, given that we wish to provision a Gigabit Ethernet (n, 1Gbit/s) service then we would provision it across (7) STS-nc VT’s, where each of the VCG members carry a bandwidth equivalent of V = n/k, where in this case n = 1Gb and k = 7. What typically happens is that the data is interleaved such that the first byte is put onto VT1, the second byte is put onto VT2, and so on until the seventh byte is put onto VT7. The process repeats beginning with the eighth byte which is sent out on VT1.
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